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Once again iPhone 4 has been hacked by Charlie Miller at Pwn2Own hacking contest held at Vancouver. The iPhone 4 running on iOS 4.2.1 was hacked by using an exploit found in Mobile Safari to swipe the address book of the compromised iPhone.But now those iOS devices running on iOS 4.3 are safe from this vulnerability as ASLR (Address Space Layout Randomization) has been implemented on iOS 4.3.